Regarding lightweight discs, I find it more difficult to “feel the hit” with them, and my timing goes downhill if I use them regularly. I have had some private lessons from pros who have encouraged practicing with heavier discs, like 200g condors or ultimate discs, to help develop timing. So maybe I’m not the only one who has this issue.

^ This is why I recommend swinging/tossing a sledgehammer to get the feeling of connecting everything taut through the body/arm/grip.

Condors are fun, they do require a slight adjust to regular discs because they are such large diameter/longer lever.
Size technically does matter.